Tier 0

Characters that usually stand hierarchically above everything, including existence and nonexistence, possibility, causality, dualism, the concepts of life and death, etcetera.

To even be considered for Tier 0, a character must at the very least transcend baseline 1-A characters in the same manner that they exceed ones who are bound by dimensions.

It is also important to note that such characters are not omnipotent, as such a concept isn't well suited for our tiering system. High outerversal characters, although immeasurably powerful, can display minor weaknesses and limitations, and be rivaled or even surpassed by other beings within their respective verses.